Supplement Dosage Calculator 2026: Evidence-Based Doses

The most-shared question we get: “How much should I take?” This free calculator returns the dose from peer-reviewed human RCTs — for 20+ popular supplements across 7 goal categories.

How To Use This Calculator

  1. Select supplement — choose from 20 evidence-backed compounds (creatine, magnesium, ashwagandha, omega-3, NMN, and more).
  2. Pick your goal — different goals = different doses. Sleep ashwagandha differs from athletic ashwagandha.
  3. Enter bodyweight — required only for weight-scaled doses (caffeine, protein). Optional otherwise.
  4. Read your dose + protocol — get the dose, timing, form, and important warnings.

Where Do These Doses Come From?

Every dose in this calculator is derived from peer-reviewed human clinical trials — not animal studies, not marketing claims. We apply our 5-criteria methodology:

  1. At least 2 well-designed human RCTs on healthy adults
  2. Measurable effect on validated outcomes (sleep scales, strength tests, blood markers)
  3. Bioavailable form at clinical dose
  4. Safety in long-term use
  5. Third-party verified product purity

Important: Educational Tool Only

This calculator is educational. It does not replace medical advice. If you take prescription medications, have a chronic condition, are pregnant/breastfeeding, or are under 18, consult your physician before starting any supplement. Some compounds (berberine, ashwagandha, vitamin K2) interact with common medications.

⚡ Quick Answer

Supplement Dosage Calculator 2026: Evidence-Based Doses

This calculator is educational. It does not replace medical advice. If you take prescription medications, have a chronic condition, are pregnant/breastfeeding, or are under 18, consult your physician before starting any supplement. Some compounds (berberine, ashwagandha, vitamin K2) interact with common medications.

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Frequently Asked Questions

▸ What is the best supplement dosage calculator?
NordVital's free Dosage Calculator covers 20+ popular supplements (creatine, magnesium, ashwagandha, omega-3, NMN, vitamin D3, etc) with doses derived from peer-reviewed human clinical trials. No signup required, no ads on the tool itself.
▸ How accurate are the supplement dose recommendations?
All doses are derived from peer-reviewed human RCTs published in PubMed-indexed journals. We use the clinically-effective dose tested in trials, not arbitrary marketing values. Each tool entry references the supplement's evidence framework.
▸ Do I enter my bodyweight for all supplements?
Bodyweight is required only for weight-scaled supplements (caffeine, protein). For most others, dose is fixed regardless of weight (creatine 5g, magnesium 300-400mg, etc).
▸ Is this calculator safe to use without consulting a doctor?
The calculator is educational. If you take prescription medications, have a chronic condition, are pregnant/breastfeeding, or are under 18, consult your physician before starting any supplement. Use our Interaction Checker for known drug interactions.
▸ How often is the dose data updated?
We review and update doses every 6 months as new RCTs are published. The "last updated" date appears on each tool page.